If you are saying that dutch actually came into existence as a blend from both you are incorrect.
If you mean as far as resemblance dutch is in between english and German then you are correct.
English actually evolved from north Sea germanic dialects (or ingvaeonic) which was spoken along the coast of the Netherlands Germany an Denmark. And brought to britain around 500 AD. (So it is the youngest of them all it nearly completely pushed out the language(s) originally spoken in britain )
After that it was influenced by old Norse and old Normandic. But still the closest resembling to modern English is Frisian (spoken in the province of friesland. It has official language status)
Hij really doesn't sound like hey. So you shouldn't give people that are learning the language that idea. The suggested hi below is much closer. (I kept thinking about the first sound in high myself but was still trying to think if I can come up with something that is an exact match, haven't found anything closer yet. Rememember though the h in hij is harder than the one in English hi)
Because human phonetically is something more like youmun. So the only thing that doesn't really match up is ng instead of m. I understand how you thought of this word (though at first I thought what on earth?? But then I started saying han several times out loud and yea i can see it)